6926048: Improve Zero performance
Summary: Make Zero figure out result types in a similar way to C++ interpreter implementation.
Reviewed-by: kvn
Contributed-by: gbenson@redhat.com
/*
* Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
* Copyright 2007, 2008, 2010 Red Hat, Inc.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
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*/
protected:
// Size of interpreter code
const static int InterpreterCodeSize = 6 * K;
public:
// Method entries
static void normal_entry(methodOop method, intptr_t UNUSED, TRAPS);
static void native_entry(methodOop method, intptr_t UNUSED, TRAPS);
static void accessor_entry(methodOop method, intptr_t UNUSED, TRAPS);
static void empty_entry(methodOop method, intptr_t UNUSED, TRAPS);
public:
// Main loop of normal_entry
static void main_loop(int recurse, TRAPS);
private:
// Stack overflow checks
static bool stack_overflow_imminent(JavaThread *thread);
private:
// Fast result type determination
static BasicType result_type_of(methodOop method);